Jarring tool



Nov. 26, 1935. l. J. flvlfjlJLLouGH JARRI NG TOOL Filed oct. 7, 1955 m AM Patented Nov. 26, 1935 Unirse STATES LZZSS PATENT .orties JARRNG TOOL lira J. McCullough, Huntington Park, Calif., as-

signor to James A. Kammerdiner, Los Angeles,

Calif.

Application October '7, 1933, Serial No. 692,633

6 Claims.

vide a jarring tool that does not inteiere with the circulation of fluid through the operating string.

It is another object of the invention to provide a jarring tool that embodies two sections that are connected for limited relative longitudinal movement and a means for releasably holding the sections in a contracted position which is releasable, upon a predetermined strain being imparted to the tool, to cause shoulders on the sections to be brought into jarring engagement.

It is a further object of the invention to provide a jarring tool in which the meansfor releasably holding the sections against movement may be adjusted to release the sections for movement upon various tensile strains being imparted to the tool.

Other objects and features of my invention will be best and more fully understood from the following detailed description of a typical preferred form of the invention throughout which disclosure reference may be had to the accompanying drawing in which:

Fig. l is a vertical or longitudinal detailed sectional view of the tool illustrating it in the contracted or unactuated position. Fig. 2 is a View similar to Fig. 1 showing the tool in the operated -or jarring position. Fig. 3 is a vertical detailed sectional view ofk the latch or control portion or" the tool, illustrating it in a partially operated position. Fig. 4 is a view similar to Fig. 3, illustrating the latch in the released position. Fig. 5 is a side elevation of the latch provided by this invention illustrating it apart from the other parts of the tool. Fig. 6 is a bottom view of the latch, being a View taken as indicated by line 6-6 on Fig. 5. Fig. 7 is a detailed transverse sectional view taken as indicated by a line 1 1 on Fig. 1, and Fig. 8 is a detailed transverse sectional view Ytaken as indicatedby line 8-8 on Fig. 1.

The jarring tool provided by my present invention includes, generally, two main or body sections A andA B related for. limited relative longitudinal movement, and a latch or control (Cl. Z55-27) means C for releasably holding the sections A and B in a contracted position.

The body sections A and B of the tool constitute a lunit or assembly adapted to be connected between an operating string and the ob- 5 ject to be jarred or to be connected in an operating string connected with the object to be jarred. The sections A and B are related or connected for limited relative longitudinal movement and are preferably telescoped or arranged one with- 10 in the other. In the particular form of the invention illustrated in the drawing, the upper section, or section A, is tubular while the lower section, or section B, is in the form of a stem extending into the upper section. It will be obvious that the lower section of the tool `may be tubular to receive the upper section of the tool without departing from the broader aspects of the invention.

The tubular section A, which, in the particular form oi the invention illustrated is the upper section, includes a main tubular portion Ill and an upper end or head Il. The head ll is detachably screw threaded to the upper end of the main portion IE) and is provided with an upwardly projecting tapered screw threaded pin l2 to facilitate attachment to an operating string, or the like. The head l l is provided with a iongitudinal opening I3 communicating with the interior of the ,main portion lil. The main tubular portion Ill of the section A is an elongated member. The portion lll may be of a uniform external diameter throughout its length. A reduced or inwardly projecting portion I4 is provided in the lower end of theportion I0 to provide an upwardly facing annular shoulder i5 in the interior of the section A.

The section B of the tool is in the form of a stem to extend into the section A and in the particular construction shown in the drawing, is the lower section and is adapted tobe connected with Vthe object to be jarred. The section B is slidably arranged through the opening i3 in the reduced portion E4 of the section A to project into the interior of the portion it and to project downwardly from the lower end of the section A. A'suitable coupling or connecting member l 9 may be screw threaded on to the lower projecting portion of` the section B to facilitate connection with a fishing tool or the operating string. An enlargement 29 is provided on the section B within the portion l@ of the section A. The enlargement Eil provides a downwardly facing shoulder 2i which is spaced from the shoulder l5 of the section A when the sections are in the contracted position illustrated in Fig. l of the drawing. The exterior of the enlargement 23 slidably engages the inner walls of the portion I() and suitable packing 22 may be arranged in an annular recess 23 in the enlargement to seal with the walls of the portion IG. The section B has a reduced portion 24% projecting upwardly from the upper end of the enlargement 25.

A sleeve or collar Z5 is arranged on the section B between the lower end of the section A'and the upper end of the connecting member I9. The collar 25 is provided to engage the lower end of the section A to limit the stroke or extent of relative movement between the sections A and B in one direction while the shoulders I5 and 2| limit the extent of the relative movement between the sections in the opposite direction. The upper end of the collar 25 may be arranged against a shoulder 25 on the section B which retains the collar in position on the section.

In accordance with the preferred embodiment of the invention, means is provided for holding the sections A and B against relative rotation. Any suitable form of key or spline connection may be provided to hold the sections against relative rotation. In the drawing I have shown keys or splines 2l on the stem or section B to slidably operate in longitudinal keyways 23 in the section A. Longitudinal grooves 23a may be formed in the walls of the opening I8 to permit the escape of fluid trapped in the space between the shoulders I5 and 2l. In accordance with theinvention, a iluid passage 23 is provided through the section B. The passage 29 extendsV from one end of the section to the other, the upper end of the passage communicating with the interior of the portion IIl of the section A and the opposite end of the passage discharging at the lower end of the section. Lateral passages or ports 3l! extend between the passage 29 and recess 23 to permit uid pressure in the passage 29 tok force the packing .22 outwardly into eiective sealing engagement with the walls of the portion IIJ.

The latch or control means C releasably holds the sections A and B in the contracted position and is operable to release the sections for relative longitudinal movement, upon a predetermined strain being imparted to the tool, to bring the shoulder I5 into jarring engagement with the shoulder 2 I. The control means C includes, generally, a latchv 3l for engaging a projecting part or shoulder 32 cn one section of the tool and a yielding connection 33 between the latch 3IY and the other section yieldable upon a predetermined tensile strain being exerted upon a tool to permit the releasing of the latch SI.

In the particular embodiment of the invention shown in the drawing, the latch 3i is connected with the section A by the means 33 to cooperate with the shoulder 32 on the lower section B. The shoulder 32 is a downwardly facing annular shoulder on the reduced portion 24 of the section B and the latch 3l is arranged within the portion I Ii of the section A to cooperate with the shoulder 32 to releasably hold the sections in the contracted position. The shoulder 32 is spaced some distance below the upper end of the reduced portion 24. The latch 3! is suspended within the section A solely by the means 33 as will be hereinafter described.

The latch 3| includes a ring or annular body and a plurality of spring fingers 35 to cooperate with the shoulder 32. The iingers 35 project downwardly from the body 34 and may be equally spaced around the body. The fingers 35 are provided at their lower ends with enlargements 33 having upwardly facing shoulders 3l on their inner sides to engage the shoulder 32. The latch 3l is formed so that the ngers 35 normally project downwardly and radially outward from the body 34 as will be apparent from an inspection of Fig. 5 of 'the drawing. The ngers 35 may be longitudinally divided or split to render them particularly flexible.

Means is provided for confining the :fingers 33 to retain them in position where the shoulders 3l' will cooperate with the shoulder 32 when the sections A and B are in the contracted position. A retaining ring 38 is mounted on the interior of the portion i@ to hold the ngers 35 in so that the shouldersl 3l' engage the shoulder 32. The retaining ring 33 may be secured to the section A by suitable screws 39. The ring 38 has an axially extending inner wall which slidably carries the outer sides of the enlargement 36. The ring 38 is positioned so that it is opposite or radially outward of the shoulder 32 when the sections A and B are in the contracted position. The lower end of the ring 38 is spaced below the shoulder 32 when the parts are in the normal or unactuated position. The lower end of thering 38 and the outer sides of the enlargements 36 may be rounded as illustrated throughout the drawing. When the connecting or control means V33 yields a predetermined amount upon a certain strain being exerted on the tool, the section. A moves upwardly relative to the section B so that the lower end of the retaining ring 38 is moved to a position above the shoulder 32 andthe iingers 35 are permitted to spring outwardly out of engagement with the shoulder 32.

Fig. 3 of the drawing illustrates .the latch means in a partially operated position .andi Fig. 4 illustrates the latch means .in the released position where the section A is free to be operated upwardly relative to section B. The upper end of the retaining ring 38 may be tapered 'downwardly and inwardly.

The connection 33 between the latch 3I 4and the section A yields upon a predetermined tensile strain being imparted to the tool, to permit releasing of the spring ngers 35 from the shoulder 32. The connection 33 forms the sole means for carrying or suspending the latch 3l and suspends the latch 3| from the upper end of the section A. The connection 33 includes a plurality of yieldable or resilient members in the form of cables which are attached to the section A and carry the latch 3I. The members 33 may be formed of suitable stranded cable. The members 33 are arranged longitudinally or vertically Within the section A and their lower ends are attached to the latch 3I and their upper ends are secured to the section A. In the drawing I' have illustrated four equally spaced members 33 extending through openings in the latch body 33 and having heads il@ at their lower ends 13o-engage the underside of the body 313. The members 33 are preferably comparatively long and their upper ends are secured to the section A at a point adjacent its upper end. The members 33V may extend through openings 4I in a ring 32' screw threaded into the portieri I@ of the section A and may have heads I3l engaging the upper sides of the ring to prevent their displacement. The ring 42 is mounted so that it'may be adjusted vertically or longitudinally of the section A by screwing it through the portion II) to provide a means of adjusting the control means C. A lock washer or lock ring 44 may be threadedinto the Vcluding,` two sections connected for limited relaportion l to ser orner'V ythe ring 42 in' position. A guide ring or member '46- maybe mountedli on the inner walls of the portion l5 to guide the cable members 33 and to limit the upward movement of the latch 3|. The guide member 46 is spaced some distance above the retaining ring 38. The members or cables33 are sufficiently yieldable and resilient to yield a given extent under a under a predetermined tensile strain without becoming over-stretched or without failing. It will be apparent that by adjusting the ring 42 longitudinally of the section A that the tensile strain required Ato stretch or elongate the members 33 suiciently to permit the release of the latch 3| may be varied to provide for the operation of the tool under any given strain.

In operation, assuming that the section B is connected with a stationary object to be jarred, and that the section A is attached to an operating string, an upward pull or strain. is exerted on the section A. The upward pull on the section A through the operating string causes stretching or elongation of the string and the cable members 33. Upon a predetermined strain being exerted upwardly on the section A, the cables 33 are stretched so that the section A moves upwardly to a position where the lower end of the retaining ring 38 is above the shoulders 32 in which position the spring fingers 35 are free to spring outwardly to release the section A for. movement relative to section B. Upon releasing of the latch fingers 35 from the shoulder 32 the upward strain together with the resilience of the stretched operating string, causes the shoulder |5 to be brought into engagement with the shoulder 2| with great force to impart a substantial jarring action to the section B. To reset the tool or to returnthe parts of the tool to their contracted positions after actuation, the upper section Ill is lowered to the position illustratedin Fig. 1 of the drawing. Upon the upper section A being lowered to its down or contracted position, the cable members 33, which remain under tension until the tool is reset due to the enlargements 36 engaging under the ring 33, operate throughtheir resilience to pull the latch 3| upwardly so that the spring fingers 35 are forced inwardly and pulled upwardly into the ring 38. With the latch 3| in its up position where the enlargements 35 engage the shoulder 32, the tool is set or prepared for further operation.

It is to be noted that the jarring tool provided by my present invention is particularly simple in construction and operation. The tool may be operated and reset for operation through simple reciprocation of the operating string to which it is attached. Further, the circulation of the fluid through the operating string and the tool is not cut off or varied during operation of the tool. The wearing parts, that is the latch 3|, cables 33, ring 38, etc., are of simple and inexpensive construction and are readily replaceable.

Having described only a typical preferred form of my invention, I do not wish to limit myself to the specific details set forth, but wish to reserve to my lf any changes or variations that may appear to those skilled in the art or fall within the scope of the following claims:

Having described my invention, I claim:

1. A well tool of the character described intive longitudinal movement, and means for releasably holding the sections vagainstrelative longitudinal movement including, a tubular member in one section, a latch, integral spring fingers on the latch extending through the tubular member and held thereby in cooperation with a shoulder on the other section, the fingers `formed to normally spring Vout of engagement with the shoulder through their inherentresiliency, and a yielding connection between the latch and the section carrying the retaining member whereby the sections are moved relative to I one another upon a predetermined ,strain being exerted on the tool to vmove the member out of retaining position.

2. A well tool of the character described including, two sections connected for limited relative longitudinal movement, and means for releasably holding the sections against relative longitudinal movement including, a shoulder on Vone section, a projecting retaining member on the other section, a latch, spring fingers on the latch extending through said member to be held in cooperation with the shoulder by said member, fingers normally tending to spring out of engagement with the shoulder through their inherent resiliency, and a yielding connection between the latch and said other section whereby the sectionsare moved relative to one another upon a predetermined strain being exerted on the tool to move the member out of finger retaining position, said connection including an extensible and resilient cable connecting the latch Vwith said other section.

tubular' retaining member fixed on the other section through which the fingers extend and which has engagement with the enlargements to conne the fingers, and a connection between the latch and the saidrother section yieldable upon a predetermined strain being exerted on the tool to cause the retaining member to be moved out of retaining engagement with the enlargements.

4. In a well tool of the character described including, two sections related for limited relative longitudinal movement, and means releasably holding the sections against relative movement including a latch, a shoulder on one section, spring fingers on the latch having enlargements to engage under the shoulder, the fingers normally tending to spring out of engagement with the shoulder through their inherent resiliency, a tubular retaining member on the other section through which the fingers extend and cooperating with the enlargements to retain them in engagement with the shoulder, and a connection between the latch and the said other section yieldable upon a predetermined strain being exerted on the tool to release the retaining member from the enlargements.

5. In a well tool, a tubular section, a stem section extending into the tubular section, the sections being related for limited relative longitudinal movement,` and means releasably holding the sections against relative movement, including a latch within the tubular section, a shoulder on the stem section, a retaining member on the Wall of the tubular section a spring finger on the latch extending through the member, an enlargement on the finger held in engagement with the shoulder by said member, the nger normally tending to spring-outward through its inherent resiliency to disengage the enlargement from the shoulder, and an extensible member -suspending the latch from the tubular section yieldable upon a predeterminedvstrain to cause disengagement of the retaining member from the enlargement.

6. A rotary jar including a tubular section,

largement on the stem section presenting an axially facing shoulder, a latch having a spring finger extending longitudinally through said part to be retained in engagement with the shoulder by said part, and means connecting the latch with the tubular section and yieldable under a longitudinal strain on the sections whereby the retaining part may be moved out'l of retaining cooperation with the linger.

IRA J. MCCULLOUGH. 

